pho·no·lite (f  n -l t )n. A light-colored volcanic rock composed largely of feldspars. pho no·litic (-l tk) adj. |
phonolite [ˈfəʊnəˌlaɪt]
n
(Earth Sciences / Geological Science) a fine-grained volcanic igneous rock consisting of alkaline feldspars and nepheline
[via French from German Phonolith; see phono-, -lite]
phonolitic [ˌfəʊnəˈlɪtɪk] adj
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